Oil burner



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D. I. SELFRIDGE OIL BURNER Filed Dec. 1., 1923 Patented Aug. 12, 1924.

1 UNITED STATES DUNCAN I. SELFRIDGE, OF STRAEFORD, PENNSYLVANIA.

OIL BURNER.

Application filed. December 1, 1923.

To all whom it may concern.

Be it known that I, DUNCAN I. SELFRIDGE, a citizen of the United States, residing at Strai'ford, in the county of Chester and State of Pennsylvania, have invented certain new and useful Improvements in Oil Burners; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to. which it appertains to make and use the same.

The present invention relates to improvements in oil burners, and the primary ob ject thereof is to provide an oil burner of variable capacity in which the spray may be diminished or enlarged by a simple adjustment without having to dismantle the burner or to effect a substitution of parts as is now generally required.

Other objects of the invention are to provide in a simple and inexpensive construction a variable capacity oil burner in which the adjustment may take place from a point distant from the tip admitting of adjustment during the operation of the burner or when hot; wherein the moving parts are carried by the removable tipso that detachment of the tip gives access to such parts for cleaning, adjustment and repair; and to provide a burner of this type in which a better and more effective spray is achieved at different ranges.

INith the foregoing and other objects in view, the invention. will be more fully described hereinafter, and will be more particularly pointed out in the claims appended hereto.

In the drawings, wherein like symbols refer to like or corresponding parts throughout the several views,

' Figure l is a plan View, partly broken away, of an improved burner constructed according to the present invention.

Figure 2 is a section taken on the line 22 in Figure 1.

Figure 3 is a section taken on the line 33 in Figure 2, and

Figure 4 is a section on line 44 of Figure 2.

Referring more particularly to the drawings, 4 designates the burner tip having the relatively deep cylindrical flange 5 provided with the threads 6 for screwing upon the end of the pipe 7. The burner tip is of inverted cup shape, and is provided at its upper closed portion with an inverted Serial No. 677,975.

frusto-conical opening or nozzle 8 coinciding substantially with the axis of the tip. The nozzle is countersunk and upon the interior face of the top of the tip is drilled or otherwise provided a shallow conical recess 9 which extends in part through the conical opening 8. In this recess 9 is seated the conical plug 10 having the three holes 11, 12 and 13 drilled therein parallel to the axis of the plug, but being separated by desired angular distances and being equidistant from the center of the disc in order that these holes or ports may be brought successively and selectively into registry with the conical opening or nozzle 8. VVithin the plug 10 and resting thereagainst and coupled thereto as by the use of pins, welding or the like, is a disc 14 adapted to rotate with the plug 10 and being guided in its movement by the walls of the recess 9. In the disc 14 are the chambers 15, 16 and 17 also being upon radii of the disc equidistantly from the center of the disc and being separated by substantially the same angular distances as the ports or holes 11, 12 and 13, which holes or ports communicate with the chambers respectively, the chambers opening out upon the outer face of the disc 14, and the ports or holes being substantially co-axial with the chambers. The chambers are, however, of greater diameter than the ports as indicated in igure 2. A number of tangential grooves 18, 19 and 20 connect with the peripheral edges of the cylindrical chambers. These grooves are shown to be three in number for each chamber and to be spaced substantially equal distance apart considered from an angular standpoint. These grooves open upon the periphery of the disc 14 and communicate with the interior space of the tip and the pipe 7-.- A lug 21 projects axially from the inner face of the disc, and is embraced by the outer end of the coil spring 22, the inner end of which fits in a similar manner about a stud 23 carried upon the diametric bar 24. This bar is secured in the cylindrical flange 5 of the tip beyond the threads 6. The disc 14 is provided with teeth 25 upon its periphery disposed in mesh with a pinion 26 made fast upon the shaft 27 which is journaled through the bar 24 and pro vided with the trunnion 28 seated within the bearing recess 29 in the interior face of the tip. A coil spring 30 extends about the shaft 27, bearing at one end against the pinion 26 and at. the other against the diametric bar 24. The shaft 27 extends sub stantially the length of the pipe 7 and is provided with an elliptical or other peculiarly shaped end 31 received within a complementally formed socket 32 upon the inner end of the spindle 33 which projects through the stuffing box 3% in the body of the burner 35, and carries on the exterior a hand wheel 36 cooperating with an index or pointer 37 secured upon the body 35. 7 Numbers or other indicia may be carried by the hand wheel for showing in connection with the index 37 the proper position of the hand wheel for bringing any one of the three ports and chambers opposite the nozzle or opening 8 in the tip. The pipe 7 is coupled to the body 35 by the union 38 and the body is provided with a part 39 by which a supply of oil under suitable pressure is let into the pipe and tip. 7

In the operation of the device, in the absence of pressure in the burner, the coil springs 22 and 30 will hold the plug disc and pinion up against the inside face of the burner tip 4;. Vhen oil under pressure is present within the burner, however, this will form the main factor in holding these parts tightly against the burner tip so that no leakage occurs about the plug. The oil will find its way through the various tangential grooves and into the chambers, and when any particular chamber is brought opposite the opening or nozzle 8, the oil will be afforded the chance of escape. The supply of oil will therefore be dependent upon the size of the chamber and the tangential grooves will tend to impart a whirling motion to the oil such as will better atomize it and prepare it for coinbustion.

The tip 4 may be unscrewed from the pipe 7 and all of the working parts will come off therewith so that easy access is had to these parts, and they may be easily cleaned and replaced. The shaft 27 is easily replaced in the socket 32 of the spindle when refitting the burner tip l upon the pipe 7. By rotating the hand wheel 36 the disc and plug may be brought to a proper position for giving the desired amount of spray.

I am aware that prior devices have been proposed in which the nozzles, however, produce only solid jets and in which, secondly, any adjustment of them must be made from the tip. This clearly obviates their use as oil burners, and, as the jets are solid ones, these present nozzles cannot be used for the purpose of spraying material for de-hydration purposes. In other words, they can handle only solid bodies of liquid, and cannot produce finely atomized hollow cone sprays.

It is obvious that various changes and modifications may be made in the details of construction and design of the above spc cifically described embodiment of this invention without departing from the spirit thereof, such changes and modifications being restricted only by the scope of the following claims.

hat is claimed is:

1. An oil burner comprising a tip having an oil escape opening, a member rotatably mounted within the tip and eccentric to the tip with separate oil chan'ibcrs therein of varying capacities and having ports in said member to register with the escape opcnin", said ports being of diflerent sizes in proportion to the respective chan'ibcrs, said men. her having tangential grooves or ducts connecting with the chambers and with the interior space of the burner, and means to rotate the member.

2. An oil burner comprising an inverted cup-shape tip having an oil escape opening, a member for controlling the oil supply to the opening mounted for rotary movement in said tip and having chambers of varying sizes adapted to register selectively with the oil escape opening and in connection with the oil space in the burner, a shaft to rotate said member, and means carried by said tip for mounting said member and shaft whereby said parts are removable with the tip.

3. An oil burner comprising an inverted cup-shape tip having an oil discharge opening, a control member titted eccentrically and rotatably in said tip and having independent and angularly separated chambers in connection individually with the oil space ofthe burner and adapted to register selectively with the discharge opening, a shaft, gear means between the shaft and member, yieldable means carried by the tip for holding the member and shaft against the tip, and a spindle releasably connected to the shaft and having indexed operating means on the exterior of the burner.

DUNCAN I. SELFRIDGE. 

